<template>
  <div>
    <div class="father">
      <div
        class="box"
        :class="{ active: id === 1 }"
        @click="
          {
            id = 1
          }
        "
      >
        1
      </div>
      <div
        class="box"
        :class="{ active: id === 2 }"
        @click="
          {
            id = 2
          }
        "
      >
        2
      </div>
      <div
        class="box"
        :class="{ active: id === 3 }"
        @click="
          {
            id = 3
          }
        "
      >
        3
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      id: 0,
    }
  },
  methods: {},
}
</script>

<style>
.box {
  border: 1px solid #333;
  width: 250px;
  height: 250px;
}
.father {
  display: flex;
}
.active {
  background-color: #087;
}
</style>
